🔍 Key Concepts

• Gear-type flexible coupling construction and purpose • Difference between radial (angular) misalignment and axial movement (end float) compensation • How sliding surfaces in couplings allow movement without losing torque transmission

💭 Think About

• Visualize a gear-type flexible coupling in cross-section: which parts must be able to move back and forth along the shaft while still staying engaged? • Which option describes sliding between mating teeth of two coupling components, and which describe something happening elsewhere in the system? • Ask yourself: in a real coupling, what is the simplest way to allow axial movement without changing tooth design or oil clearance in other machinery parts?

✅ Before You Answer

• Identify which answer choice actually involves sliding between two coupling members (not between a gear and its own shaft or changes in oil clearance). • Check whether any option talks about changing tooth pitch or oil clearance—would that realistically be used for axial flexibility in a standard gear-type flexible coupling? • Confirm that the correct mechanism must allow continuous torque transmission while permitting limited axial travel.